In this study the change of molecular weight and products from process such as pyrolysis and supercritical THF pyrolysis were carried out for tire and SBR. The benzene types identified as major component of the oil derived from pyrolysis of SBR. Likely, benzene based products were found to be more for supercritical pyrolysis than other products relatively. The degradation was found to went well as variables such as pressure, temperature, and time increased.